[PATCH] honor hard barrier in deadline

Previously, we only honored barriers wrt merging. Really honor them now,
move all pending requests to dispatch list and add the hard barrier at
the back.

diff --git a/drivers/block/deadline-iosched.c b/drivers/block/deadline-iosched.c
index a107ec9682ce77aea4412a9e82ad2f74c0ff42d6..6735d56e2264fc8b0f3f995b3d2e98a218984a0f 100644 (file)
--- a/drivers/block/deadline-iosched.c
+++ b/drivers/block/deadline-iosched.c
@@ -608,6 +608,12 @@ deadline_insert_request(request_queue_t *q, struct request *rq,
        if (unlikely(rq->flags & REQ_HARDBARRIER)) {
                DL_INVALIDATE_HASH(dd);
                q->last_merge = NULL;
+
+               while (deadline_dispatch_requests(dd))
+                       ;
+
+               list_add_tail(&rq->queuelist, dd->dispatch);
+               return;
        }
 
        if (unlikely(!blk_fs_request(rq))) {